diff --git a/example/ex2/ex2.cpp b/example/ex2/ex2.cpp
index 3fc1c94f..936704d9 100644
--- a/example/ex2/ex2.cpp
+++ b/example/ex2/ex2.cpp
@@ -8,7 +8,7 @@ int
 main () {
     namespace q = xo::qty::qty;
     namespace su = xo::qty::su;
-    using xo::qty::with_units;
+    using xo::qty::with_units_from;
     using xo::qty::quantity;
     using xo::flatstring;
     using namespace std;
@@ -31,7 +31,7 @@ main () {
     cerr << "a2: " << a2 << endl;
 
     constexpr auto au = q::meter / (q::second * q::second);
-    constexpr auto a3 = with_units(a, au);
+    constexpr auto a3 = with_units_from(a, au);
 
     static_assert(a3.abbrev() == flatstring("m.s^-2"));
 
diff --git a/include/xo/unit/quantity.hpp b/include/xo/unit/quantity.hpp
index de061b1f..5b3a810c 100644
--- a/include/xo/unit/quantity.hpp
+++ b/include/xo/unit/quantity.hpp
@@ -231,7 +231,7 @@ namespace xo {
                   && Q1::always_constexpr_unit
                   && Q2::always_constexpr_unit)
         constexpr auto
-        with_units(const Q1 & x, const Q2 & y)
+        with_units_from(const Q1 & x, const Q2 & y)
         {
             return x.template rescale<Unit>();
         }